Experimental analysis of spatial force performance of concrete-reinforced stone arch bridge based on enlarged section method

There exist some problems in traditional analysis method of concrete stress test, such as low fitting degree and high complexity. To solve these problems, an experimental analysis method of spatial stress performance of concrete reinforced stone arch bridge based on enlarged section method is proposed. First, the concrete grade is determined as C30, and the concrete is poured with 150 mm×150 mm×150 mm cube. Ribbed steel bars, 14 mm HRB335 longitudinal tension steel bars and 8 mm HPB stirrups are used as design materials for steel members. Then, the shape and size of concrete reinforced stone arch bridge specimens are set up, the specimens are grouped, and the specimens are made according to the manufacturing process. Third, according to the design and fabrication of specimens, the reinforcement section is divided into meshes and strips, the number of meshes in the transverse and longitudinal directions and the number of strips in the reinforcement section are input. Fourth, the spatial mechanical properties of the reinforced stone arch bridge are tested by low-cycle repeated loading, and the concrete strain at the center of any element is calculated. Fifth, the concrete strain is increased on one side of the section near the axial force, and the next step related calculation is carried out until the concrete compressive strain value near the axial force is larger than the ultimate compressive strain value. Finally, the parameters that meet the preset conditions are outputted, such as the ultimate value of the space stress of the concrete reinforced stone arch bridge, and the test is completed. The experimental results show that the method has high fitting degree, about 98%, low running complexity and feasibility. © 2020, Jilin University Press. All right reserved.